One thing i noticed with Mj 1200 though is that the flow being directed and the glass being curved its causing too much flow in the front where we'd like to keep chalices and rics and mushrooms ( all of them like medium flow) s
so i went with a MJ600 instead and added additional powerhead in the display area ..
Go with a cobalt mj much more quieter than the marine lands but it will cost a little more, i would also go with a 1200 for a biocube 29.. I have 2 cobalt 900's in my jbj 28g